I have no idea when you might a reply but it might help making a post in the tech support sub-section viewforum.php?f=268 (though I would assume a developer would've noticed it here either way but there is a chance that some staff have subscribed to that forum). You could also try the steam discussion page and if everything fails you could email support@slitherine.co.uk which seems to be the support email given by the game's website.

There is a post on top of the tech-support-subforums stating how to properly report a bug.
The most important thing is to provide the log files. Those most likely hold valuable information as to why the master-server could not be contacted.

stronggye4 wrote:Whenever I try to play multiplayer with my friends it does not work for me. When I try and search for a game on the list it said 'could not connect to master server'. Any ideas how to fix this?